text: import {sum, mul, sub, div} from './math';
  
  test("Adding 1 + 1 equals 2", () => {
      expect(sum(1, 1)).toBe(2)
  })
  
  test("Multiplying 1 * 1 equals 1", () => {
      expect(mul(1, 1)).toBe(1)
  })
  
  test("Subtracting 1 - 1 equals 0", () => {
      expect(sub(1, 1)).toBe(0)
  })
  
  test("Dividing 1 / 1 equals 1", () => {
      expect(div(1, 1)).toBe(1)
  })
  
  // NOTE: .toThrow() did not handle exception generated by the div function
  test("Dividing 1 / 0 return NaN", () => {
      expect(div(1, 0)).toBe(NaN)
  })
  